Example 2, Instruction formats and opcodes, Sub d0,d1,d2 – Freescale Semiconductor StarCore SC140 User Manual
Page 704
A-390
SC140 DSP Core Reference Manual
SUB
Example 2
sub d0,d1,d2
Scaling up is set in SR[5], so L2 bit is set from overflow from bit 30.
Instruction Formats and Opcodes
Note:
** indicates serial grouping encoding.
L2:D2
$0:$FF FFFF FFFD
EMR
$0000 0000
Register/Memory Address
Before
After
D0
$FF D000 0000
D1
$00 2000 0000
SR
$00E4 0020
$00E4 0021
L2:D2
$1:$00 5000 0000
EMR
$0000 0000
Instruction
Words Cycles Type
Opcode
15
8
7
0
SUB #u5,Dn
1
1
1
0
*
1
1
1
0
F
F
F
1
1
i
i
i
i
i
15
8
7
0
SUB Da,Db,Dn
1
1
1
0
*
1
0
1
1
F
F
F
0
0
J
J
J
J
J
15
8
7
0
SUB Db,Da,Dn
1
1
1
0
*
1
0
1
1
F
F
F
0
1
J
J
J
J
J
15
8
7
0
SUB Da,Da,Dn
1
1
1
0
*
1
0
0
0
F
F
F
1
1
0
0
1
j
j
Register/Memory Address
Before
After